Pump



G; F. GRAHAM.

PUMP.

APPLICATION FILED MAY 27, 1920. 1,380,896, Patented June 7, 1921.

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PUMP.

Specification of Letters Patent.

Patented June 7, 1921.

Application filed May 27, 1920. Serial No. 384,548.

T 0 all whom it may concern:

Be it known that I, GEORGE F. GRAHAM, a citizen of the United States, residing at Cleveland in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Pumps, of which .the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to double acting pumps, such as are employed for the purpose of inflating tires of automobiles. The objects of the invention are to provide a pump of this character which will be extremely simple in construction and economical of production, but which, nevertheless, will be efiicient in operation. I attain these objects in and through the construction and arrangement of parts shown in the drawings hereof, wherein Figure 1 represents a sectional side elevation of a pump constructed in accordance with my invention; and Fig. 2 a sectional view corresponding to the line 22 of Fig. 1,-the gear segment being shown in elevation.

Describing the parts by reference characters, 1 denotes a seamless steel tube, which.

may be of about 16 gage. At its central portion, the tube is longitudinally split and is cut out, as shown at 2, the parts on each side of the split being formed into parallel plates 3, for a purpose to be described hereinafter.

The opposite ends of the tube 1 are closed,

as by means of heads 4 having flan es 5 which are threaded into such ends. ach head may be provided with a squared. projection 6, for the application of a wrench, and each flange is provided with an aperture/T, adapted to register with an aperture 8 in the end of the tube coiiperating therewith, the apertures 7 and 8 receiving jointly each a connwtion 9 containing a valve of the ordinary ball type (not shown). To each connection 9 there is-secured a hose 10, the ends of the hose opposite their connections 9 being united by a T 11 to the central branch of which the delivery hose 12 is connected. The last mentioned hose may be provided with any type of connection 13 adapted to cooperate with the filling connection of a tire. I

The opposite ends 14 of the tube 1 constitute cylinders for a double acting pump,

the pistons 15 whereof are connected by the piston rod 16 provided at its central portion with rack teeth 17.

The plate 3 constitutes a support for the hanger for the central or rack-bar portion of the piston rod. This hanger in turn is so formed as to constitute brackets which support the segment and the operating handle by which the pistons are reciproca-ted through the piston rod. The hanger for the piston rod comprises a single sheet of metal of U-shape in section, the sides 18 and the bottom 19 of said hanger being preferably coextensive in length with the length of the plates 3. The sides 18 are scoured, as by means of rivets 20, to the plates 3. Above these plates, the sides 18 are trian larin shape, as shown at 21, and are provi' ed each with an opening 22 in its upper portion, said openings constituting bearings forpins or trunnions 23 projecting on opposite sides from a segment 24 having teeth 25 adaptedto mesh with the rack bar teeth 17. This segment is provided with an off-set socket 26 which is adapted to receive an operating handle 27.

Secured to one of the plates 3, as by a rivet 28 and the cooperating side plate 18 is a strap 28 the lower end of which is adapted to extend beneath a suitable support 29, such as the running board of an automobile, and is there provided with a clamped screw 30 whereby the pump may be detachably secured to such support.

In operation, the pump may be quickly and conveniently clamped to the running board of an automobile, the delivery hose 12 connected to the filling connection of the tire by means of the connection 13 and, by moving the handle 27 back and forth, the pistons will be operated in the opposed cylinders so that, when air is being forced from one of the cylinders into the tire, the other cylinder will be drawing air thereinto to be expelled by movement of the piston rod i the reverse direction.

By the construction illustrated and de scribed, it will be evident that a complete eflicient double acting pump may be produced from a minimum number of parts and at a minimum expense; also that the weight of the pump will be inconsiderable with corresponding ease of handling and saving in the cost'of shipment.

Having thus described my invention, what I claim is 1. A double acting pump comprising a continuous tube having the opposite ends thereof closed to produce opposed cylinders, the metal at the central portion of such tube being split and bent outwardly to form a pair of spaced plates, a piston for each cylinder, a rod common to and connecting both pistons, and means supported from said plates for operating said rod.

2. A double acting pump comprising a continuous tube having its opposite ends closed to provide opposed cylinders and having the metal at the central portion formed into a pair of spaced plates, a piston for each cylinder, a piston rod connecting said pistons and having its central portion provided with rack teeth, a hanger for supporting the central portion of said piston rod and connected to the said plates, and'a segment having teeth adapted to mesh with the rack teeth and pivoted in extensions of said hanger.

3. A double acting pump comprising a continuous tube having its opposite ends closed to provide opposed cylinders and having its central portion slotted, with the metal on opposite sides of such slot bent outwardly to provide parallel supporting plates, a piston for each cylinder, a piston rod connecting said pistons and having its central portion provided with rack teeth, a U-shaped hanger for the central portion of said piston rod and having its opposite sides secured to the said plates, the sides of the said hanger being extended above and beyond said plates, a gear segment pivoted in the upper ends of such hanger extensions and having teeth adapted to mesh with the rack teeth of the piston rod, and a clamping plate also connected with one of the first mentioned plates.

4. A double acting pump comprising a continuous tube having its opposite ends closed to provide opposed cylinders and having the metal at its central portion bent outwardly to provide supporting plates, :1 piston for each cylinder, a piston rod connecting said pistons and having its central portion provided with rack teeth, a U- shaped hanger for the central portion of said piston rod and having its opposite sides secured to the said plates, the sides of the said hanger being extended above and beyond said plates, and a gear segment piv- Oted in the upper ends of such hanger extensions and havin teeth adapted to mesh with the rack teeth of the piston rod.

In testimony whereof I hereunto affix my signature.

GEORGE F. (irRAHA'M, 

